Here is my modification to the stock STAN barrel to get a skinny post. I added a bit of skateboard tape to make it stickier but if you had the tools you could knurl it yourself or rough it up. If you wanted to take the time you could round everything and make it really look stock, but I don't have the patience. Maybe someone with a CNC machine could knock out a bunch that look more professional (closed circuite to Minx)
I used a vice and hack saw and a file to get it to this state, the post is just as adjustable as the original barrel but I thought it may not be strong enough so I used a full-length hex screw to lock it down and provide some stiffness. If I had a headless this size and about 3/4" long, I would have used it and gotten rid of the head.
This took me 20 minutes or so.
Hope you like it!